Spring clamp



FIG. 1 is a perspective view of a spring clamp embodying my new design.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a rear elevational view thereof.

FIG. 4 is a top plan view thereof, the bottom being identical.

FIG. 5 is a side elevationa view thereof. 

The ornamental design for spring clamp, as shown and described. 